NUnit1014

The async test method must have a Task<T> return type when a result is expected

Topic	Value
Id	NUnit1014
Severity	Error
Enabled	True
Category	Structure
Code	TestMethodUsageAnalyzer

Description

The async test method must have a Task<T> return type when a result is expected.

Motivation

To prevent tests that will fail at runtime due to improper construction.

How to fix violations

Example Violation

[TestCase(1, ExpectedResult = true)]
public async Task NUnit1014SampleTest(int numberValue)
{
    return;
}

Explanation

The NUnit ExpectedResult syntax is used, so this method needs to return a type that matches the type of expected result you're looking for.

Fix

Remove the ExpectedResult syntax:

[TestCase(1)]
public async Task NUnit1014SampleTest(int numberValue)
{
    Assert.Pass();
}

Or, update the return task type to be what you're looking for, e.g. Task<bool> below:

[TestCase(1, ExpectedResult = true)]
public async Task<bool> NUnit1014SampleTest(int numberValue)
{
    return Task.FromResult(true);
}

Configure severity

Via ruleset file

Configure the severity per project, for more info see MSDN.

Via .editorconfig file

# NUnit1014: The async test method must have a Task<T> return type when a result is expected
dotnet_diagnostic.NUnit1014.severity = chosenSeverity

where chosenSeverity can be one of none, silent, suggestion, warning, or error.

Via #pragma directive

#pragma warning disable NUnit1014 // The async test method must have a Task<T> return type when a result is expected
Code violating the rule here
#pragma warning restore NUnit1014 // The async test method must have a Task<T> return type when a result is expected

Or put this at the top of the file to disable all instances.

#pragma warning disable NUnit1014 // The async test method must have a Task<T> return type when a result is expected

Via attribute [SuppressMessage]

[System.Diagnostics.CodeAnalysis.SuppressMessage("Structure",
    "NUnit1014:The async test method must have a Task<T> return type when a result is expected",
    Justification = "Reason...")]